Seal



Oct. 9,1945. H.L. NORTHUP I 2,386,496 I,

SEAL

Filed Feb. 5. 1944 IN V EN TOR.

'tion ii. The rim portion llj of the casing is Patented Oct. 9,1945

"umran srAri-zs PAreNr orries amass SEAL Barry L. Northup, Chicago; 111., assignmto chieago Rawhide Manufacturing ,cii lm lii Chicago, 111., a corporation of Illinois .Application February 5, 1944, Serial No. sz'iaos 3Claimsr- (ctzsa-s) This-invention has to do with seals of the type commonly used in machines of various kinds ranged shaft. It includes an outer casing of sheet metal or other rigid material and an inner. sealing elementof synthetic rubber or other resiliently compressible materiaL'which sealing element is sleevedout along the shaft, is provided at one end with a lip for sealed engagement with the shaft, and is so associated with the casing as to effectively maintain the up in sealed engagement with the shaft throughout the normal life of the seal without recourse to the use of springs or other additional constrictive means. I

While the foregoing statements are indicative in a general way of the nature of the invention. other more specific objects and advantages will be apparent to those skilled in the art upon a full understanding of the construction of the new Two embodiments of the invention are presented herein by way of exempliflcation, but it will of course be understood that the invention is sus- ,ceptible of incorporation in still other structurally modifled forms coming equally within the scop of the appended claims. In the accompanying drawing:

Fig. 'i is a diametric section through a seal constructed in accordance with the invention, showing 'the'seal press fltted into an annular recess in a housing about a centrally arranged shaft;

Fig. 2 is a similar view, fore being installed;

Fig. 3 is a face view of the seal; and

showingthe s'eal be- Fig. 4 is aradial section through another seal i 45 flange portion of the packing at a point inwardconstructed in. accordance with the invention, showing a modified arrangement of the pressure equalizing ports. v

The seal shown in Figs. 1 to 3, inclusive, comprisesa metal casing II and a synthetic rubber packing II. The casing II is a one-piece centraliy'apertured cup of generally L-shaped radial sectionwhich is characterized by a cylindri cal rim portion l1, a radially extending bottom portion II and an axially opening channel poradapted to be press fitted into an annular recess I! in a housins it The channel portion l4 islecated'about the central aperture in the bottom portion It, in substantially spaced relation to the 5 rim portion ii.

The packing Ii is a one-piece ring of generally L-shaped radial section which is characterized by .an axially extending sleeve portion l'l, an annular lip portion", and a radially extending flange I 10. portion 19. The sleeve portion: II has a large diameter end 20 and a small diameter end II. The lip portion II is located at the small diameter end II of the sleeve portion, and the flange portion is extends outwardly from the small diameter end II in substantially the plane of the lip portion l8, increasing outwardly in thickness.

' The packing II is positioned within the casin Hi with'the sleeve portion H of the packing in generally parallel spaced relation to the rim portion I! of the.;casing and with the flange portion is of the packing in generally parallel spaced relation to the bottom portion I: of the casing. The large diameter end" of the. sleeve portion ll of the packing is tightly clamped within the channel portion of the casing in fluid-tight association with the latter, while the outer periphery 22 of the flange portion is of the packing .is arranged in substantially right-angular abutment with the inner surface of the rim portion II of the casing adiacentthe edge of the rim portion. The flange portion 19 is provided about its outer periphery with a plurality of openings 23 which place the hollow interior 24 of the seal in communication with the space 25in front of the seal, thereb equalizing the pressure at the opposite faces of the flange portion! 9;

' When the seal is positioned in .place'about a shaft 26 the lip portion is of the packing will be distended slightly-by the shaft and the sur- 40 rounding flange portion is will be corresponding- I 1y compressed within the'conflning rim portion lzofthe casing. I

In the modiflcationshow'n in Fig. 4 the pressure equalizing openings 21 are located in the ly of the outer periphery v of the latter. I claim 1. In a seal 'of the character described, a centrally'apertured cup, and a packing ring of resiliently compressible material positioned in the portion'which extends outwardly into abutment with the inner surface of the rim oi-the cup;

2. 'In a: seal of the character described. a centrally epertured cup having a. rim portion, and

a bottom portion which extends inwardly from one end of the rim portion: a packing ring-of resiliently compressible material halving a sleeve portion provided with a large diameter end and a small diameter end, a lip portion within the small diameter end of the sleeve portion, and aflange portion which extends outwardly from the small diameter and of the sleeve portion in substantielly theplene of the lip portion: the large diemeterend offith sleeve portion bein secured to the botton iportion of the cup in fluid-tight association with the latter; and the outer periph-' ery of the flange portion being positioned against the inner surface of the rim portion of the cup in spaced relation to the bottom portion of the latter; said flange portion being provided outwardly of the small diameter end of the sleeve" portion with one or more openings.

3. In ,a. seal of the character desoribecLe centrally apertured cup of generally L-shaped radial 7 section, which cup has a. rim portion, a bottom tion; said flange portion. increasing in thickness flange portion being confined under compression toward its outer periphery; the large diameter end of the sleeve portion of the packing ring being clamped within the channel portion of the gas ing in fluid-tight association with the letter; and the outer relatively" thick periphery of the within the rim portion oi the. cup in spaced relation tothe bottom portion of the letter; said flange portion being provixieii outwardly of the small diameter end of the sleeve portion with one or more openings.

HARRY L. NQRTHUP. 

